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#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <fuse.h>
#include "cJSON/cJSON.h"
#include "cJSON/cJSON.c"
#include "base64/base64.h"
#include "base64/base64.c"
FILE* l;
static cJSON *send_request_then_await_response(cJSON *req) {
char *request_data = cJSON_Print(req);
unsigned int request_len = strlen(request_data);
write(1, (char *) &request_len, 4); // stdout
unsigned int bytes_written = 0;
while (bytes_written < request_len) {
bytes_written += write(1, request_data, request_len);
}
/* fprintf(l, "req[%s]\n", request_data); fflush(l); */
unsigned int response_len;
read(0, (char *) &response_len, 4); // stdin
char *response_data = malloc(response_len);
unsigned int bytes_read = 0;
while (bytes_read < response_len) {
bytes_read += read(0, response_data + bytes_read, response_len);
}
/* fprintf(l, "resp(%d; expected %d)[%s]\n", bytes_read, response_len, response_data); fflush(l); */
if (response_data == NULL) {
// Connection is dead.
return cJSON_Parse("{ \"error\": 5 }");
}
cJSON *resp = cJSON_Parse((const char *) response_data);
free(response_data);
return resp;
}
// This helper macro is used to implement all the FUSE fs operations.
//
// It constructs a JSON object to represent the incoming request, then
// forwards that object to `send_request_then_await_response` (which
// then dispatches it to our browser extension over stdout). It awaits
// the response from the browser over stdin, then lets us pull that
// apart to ultimately return the data to FUSE.
//
// OP is an opcode string which the extension handles in JS.
// REQ_BUILDER_BODY is a block which should add whatever request
// properties you want to send to the browser to the `req` cJSON
// object. RESP_HANDLER_BODY should handle whatever response
// properties are on the `resp` cJSON object and pass them back to the
// kernel. It should also set the value of `ret` to the desired
// return value. (MAKE_REQ takes over return from the containing
// function so it can automatically return error values.)
#define MAKE_REQ(OP, REQ_BUILDER_BODY, RESP_HANDLER_BODY) \
do { \
int ret = -1; \
cJSON *req = NULL; \
cJSON *resp = NULL; \
\
req = cJSON_CreateObject(); \
cJSON_AddStringToObject(req, "op", OP); \
REQ_BUILDER_BODY \
\
resp = send_request_then_await_response(req); \
\
cJSON *error_item = cJSON_GetObjectItemCaseSensitive(resp, "error"); \
if (error_item) { \
ret = -error_item->valueint; \
if (ret != 0) goto done; \
} \
\
ret = -1; \
RESP_HANDLER_BODY \
\
done: \
if (req != NULL) cJSON_Delete(req); \
if (resp != NULL) cJSON_Delete(resp); \
return ret; \
} while (0)
#define JSON_GET_PROP_INT(LVALUE, KEY) \
do { \
LVALUE = cJSON_GetObjectItemCaseSensitive(resp, KEY)->valueint; \
} while (0)
static int tabfs_getattr(const char *path, struct stat *stbuf) {
memset(stbuf, 0, sizeof(struct stat));
MAKE_REQ("getattr", {
cJSON_AddStringToObject(req, "path", path);
}, {
JSON_GET_PROP_INT(stbuf->st_mode, "st_mode");
JSON_GET_PROP_INT(stbuf->st_nlink, "st_nlink");
JSON_GET_PROP_INT(stbuf->st_size, "st_size");
ret = 0;
});
}
static int tabfs_readlink(const char *path, char *buf, size_t size) {
MAKE_REQ("readlink", {
cJSON_AddStringToObject(req, "path", path);
}, {
cJSON *resp_buf_item = cJSON_GetObjectItemCaseSensitive(resp, "buf");
// FIXME: fix
char *resp_buf = cJSON_GetStringValue(resp_buf_item);
size_t resp_buf_size = strlen(resp_buf) + 1;
size = resp_buf_size < size ? resp_buf_size : size;
memcpy(buf, resp_buf, size);
ret = 0;
});
}
static int tabfs_open(const char *path, struct fuse_file_info *fi) {
MAKE_REQ("open", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "flags", fi->flags);
}, {
cJSON *fh_item = cJSON_GetObjectItemCaseSensitive(resp, "fh");
if (fh_item) fi->fh = fh_item->valueint;
ret = 0;
});
}
static int
tabfs_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi) {
MAKE_REQ("read", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "size", size);
cJSON_AddNumberToObject(req, "offset", offset);
cJSON_AddNumberToObject(req, "fh", fi->fh);
cJSON_AddNumberToObject(req, "flags", fi->flags);
}, {
cJSON *resp_buf_item = cJSON_GetObjectItemCaseSensitive(resp, "buf");
if (!resp_buf_item) return -EIO;
char *resp_buf = cJSON_GetStringValue(resp_buf_item);
if (!resp_buf) return -EIO;
size_t resp_buf_len = strlen(resp_buf);
cJSON *base64_encoded_item = cJSON_GetObjectItemCaseSensitive(resp, "base64Encoded");
if (base64_encoded_item && cJSON_IsTrue(base64_encoded_item)) {
size = base64_decode(resp_buf, resp_buf_len, (unsigned char *) buf);
} else {
size = resp_buf_len < size ? resp_buf_len : size;
memcpy(buf, resp_buf, size);
}
ret = size;
});
}
static int
tabfs_write(const char *path, const char *buf, size_t size, off_t offset,
struct fuse_file_info *fi) {
MAKE_REQ("write", {
cJSON_AddStringToObject(req, "path", path);
char base64_buf[size + 1]; // ughh.
base64_encode((const unsigned char *) buf, size, base64_buf);
cJSON_AddStringToObject(req, "buf", base64_buf);
cJSON_AddNumberToObject(req, "offset", offset);
}, {
ret = size;
});
}
static int tabfs_release(const char *path, struct fuse_file_info *fi) {
MAKE_REQ("release", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "fh", fi->fh);
}, {
ret = 0;
});
}
static int tabfs_opendir(const char *path, struct fuse_file_info *fi) {
MAKE_REQ("opendir", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "flags", fi->flags);
}, {
cJSON *fh_item = cJSON_GetObjectItemCaseSensitive(resp, "fh");
if (fh_item) fi->fh = fh_item->valueint;
ret = 0;
});
}
static int
tabfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi) {
MAKE_REQ("readdir", {
cJSON_AddStringToObject(req, "path", path);
}, {
cJSON *entries = cJSON_GetObjectItemCaseSensitive(resp, "entries");
cJSON *entry;
cJSON_ArrayForEach(entry, entries) {
filler(buf, cJSON_GetStringValue(entry), NULL, 0);
}
ret = 0;
});
}
static int
tabfs_releasedir(const char *path, struct fuse_file_info *fi) {
MAKE_REQ("releasedir", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "fh", fi->fh);
}, {
ret = 0;
});
}
static struct fuse_operations tabfs_filesystem_operations = {
.getattr = tabfs_getattr, /* To provide size, permissions, etc. */
.readlink = tabfs_readlink,
.open = tabfs_open, /* To enforce read-only access. */
.read = tabfs_read, /* To provide file content. */
.write = tabfs_write,
.release = tabfs_release,
.opendir = tabfs_opendir,
.readdir = tabfs_readdir, /* To provide directory listing. */
.releasedir = tabfs_releasedir
};
int main(int argc, char **argv) {
/* system("killall -9 tabfs"); */
char killcmd[1000];
sprintf(killcmd, "pgrep tabfs | grep -v %d | xargs kill -9", getpid());
system(killcmd);
#ifdef __APPLE__
system("diskutil umount force mnt > /dev/null");
#else
system("fusermount -u mnt");
#endif
l = fopen("log.txt", "w");
for (int i = 0; i < argc; i++) {
fprintf(l, "arg%d: [%s]\n", i, argv[i]); fflush(l);
}
char* fuse_argv[] = {argv[0], "-odirect_io", "-s", "-f", "mnt"};
return fuse_main(5, fuse_argv, &tabfs_filesystem_operations, NULL);
}
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